ĐIỆN tử VIỄN THÔNG DTVT2 nhom1 bai3 khotailieu

It measures voltages 7.a : It’s known as a variable capacitor.. It breaks a circuit 9.d : It’s known as ammeter.. It measures very small currents 10.i : It’s known as an aerial... the fu

NHÓM 1 – LỚP Đ8-ĐTVT 2

- LƯƠNG NGỌC LONG MSV: 1381510142

- HOÀNG NGỌC TRUNG MSV: 1381510176

- HOÀNG THỊ LINH MSV: 1381510140

- PHÙNG THỊ QUỲNH MSV: 1381510165

- PHẠM TRỌNG HOAN MSV: 1381510127

Unit 5 : Batteries

Task 1 :

- Because it’s handy , you can bring it with your device everywhere

- There are two kind of batteries : primary cell ( non-rechargeable ) , secondary cell ( rechargeable )

- List of the things contain batteries : Mobile phone , radio , flashlight , tape recorder , robot , clock …

Task 2 :

Zinc – carbon cell Nicad cell

Positive electrode Manganese dioxide Nickel

Task 4 :

Zinc – carbon cell Nicad cell Electrolyte The electrolyte is a

solution of ammonium chloride

The electrolyte is potassium hydroxide

resistant about 0.5 ohms

1,2V

Task 6 :

1.c : It’s called a resistor It adds resistant to a circuit

2.g : It’s called a potentiometer.It varies the current in a circuit

3.h : It’s called a transformer.It steps AC voltage up or down

4.f : It’s called a switch It protect a circuit

5.b : It’ called a diode.It recifies alternating current

6.j : It’s known as a volmeter It measures voltages

7.a : It’s known as a variable capacitor it varies capacitance in a circuit 8.e : It’s called a fuse It breaks a circuit

9.d : It’s known as ammeter It measures very small currents

10.i : It’s known as an aerial It receives RF signal

Task 8 :

1 Oscillator

2 Transmitter

3 Transfomer

4 Charger

5 Rectifier

6 Processor

7 Amplifier

8 Collector

9 Detector

10.Tuner

Task 9 :

- Fuse

- Neon lamp

- Transfomer

- Four diodes

- Electrolytic capacitor

- Zener diode

- Bipolar transistor NPN

Task 10 :

1 a

2 h

3 d

4 f

5 g

6 c

7 e

8 b

Task 11 :

1 the function is recharged to their original voltage and can be used many times over

2 - The transformer consist of a transfomer , a neon lamp , a double-pole switch , a fuse

o The rectifier is composed of four diodes which mounted an aluminium heatstick

o The smoothing circuit consist of a large electrolytic capacitor

o The stabilizing circuit is composed of a transistor biased by two resistors and a zener diode

3 - Transformer is connected to rectifier by the output of a

transformer

o Rectifier is connected to smoothing circuit by the output of a bridge rectifier

o Smoothing circuit is connected to stabilizing circuit by the output

of a largre electrolytic capacitor

4 - Transformer : step down the voltage of the AC mains

o Rectifier : converts the AC voltage to a DC voltage

o Smoothing circuit : removes the flutuations in the DC output of the rectifier

o Stabilizing circuit : Prevents the output from changing when the load varies